Heating element.



J. P. LAMB. HEATING ELEMENT.

APPLICATION FILED APR.12 191&

1,060,256. Patented Apr.29,1913.

INVENTOR Joseph ZT'Lamb:

To ciZ'Z d om it may concern fing -Elements of which the following morsrnirns .r rrssr orrron JOSEPH F. LAMB, 0F BRITAIN, CONNECTICUT,ASSIGNGR TO LANDERS, FRARY & CLARK, 1101" NEW BJRJ'I'AI'N, CONNECTICUT,A CORPORATION OF CONNECTICUT.

HEATING ELEMENT.

lessees.

- known that l, Josnrn F. 'LAMB, a

citi'zenf 'ofthe United States, and a resident of New Britaimin thecounty of Hartford end' 'state of Connecticut, have invented certain newand useful Improvements ln-liestspec'ifi'czttion. y

-The ob ect of thls in-ventlon ls-to provide a heating unit for use inutensils of var ous 7 kinds.

It is the purpose of this-invention to prevent loss of heat bypreventing the trans mission of heat to the exposed parts of elther ofthe rndlating members. 'lhxs l accomplish by the use of s valve plateintel, used between the resistance material or unit and that radiatingmember part 01" whose surface is exposed, that is to say, is not indirect' heat conductive relation to. the perts'of. the utensil which itis desired to heat, and by means of which the transmis- 851011 of heatthereto can be controlled or wholly prevented; but I do provide the saidvslveplate with surfaces which can be brought into heat conductive frelation with other parts of said radiating member or utensil'and fromwhich heat is transmitted torthe utensil. Thus I are enabled to controlthe heating of this radiating member toposed, owing to somepeculia-rconstruction or special use, they could both be treated.

along the general lines of my invention as indicated above. t a

In the drawings-lligure l. is a central vertical section of a heatingunit made in accordance with my invention. Fig. 2 is a top view theradiating member. Fig. 3

, is ato' view of the assembled unit.- Fi I I"! is a side elevntion,partly in section showing the unit installed for use.

1 Referring to the drawings, illustrating one embodiment of theinvention, 0, denotes one radiating member which as shown has anupturned flange? within which the resistance 0, here shown, as in theform of a,

coil, and the radiating member 03 are located and assembled with theproper insulation. In the case illustrated, the upper radiating memberis in heat-conductive re letion with the wall of the ut 'n the flange Z)of'z'the lower radi Specification'of Letters Patent.

ever, is exposed, that isto say, it does notdirectly contactwith thewallet the utensil and cannot well be arranged to. Consequently, thevalve plate 0 is interposed between the resistance 0 and the bottom ofthe lower member aundspnced therefrom by the projections f, or ifdesired, by blocks of insulatingmaterial, in order-to diminish theamount olL-or totally prevent, the passage of heat thereto. I

At the edges of the valve platare'fianges g which fit closely within,and have intimete surfn'cecontact with, t heliange F) on the. lowerradiating member a which in turn contacts with the wall of the utensil.These flanges are preferred since they give greater surface contact buteither or both may be dispensed with if" desired. .It will further benoted that as illustrated, the

ating .l-nembcr becomes a dead air space and so acts as an eilectiveheat insulator. The heat in the upper radiating member is transmitteddirectly, to the wall. of the utensil, and the heat in the valve platepasses not to the botton'r'or exposed portion of the lower radiatingmember but to the flange thereof which is in contact with the wall oftheutcnsil, thus mskin f it possible to utilize the full heating,eii'ect of the unit to heat the utensil, or its contents, as the casemay be, and avoiding to the greatest possible degree loss of heat due toradiation from exposed surfaces of the radiating members. Obviously, myinvention is. not concerned with the shape of the unit, or its severalparts, or to the method of installation in a utensil, nor is itconcerned with the character of the radiating members, that is to saywhether they be formed separately from, or as parts of the utensil.

I claim as my invention:

1. In a device of the character described Patented Apr. 29,1913..hpplication filed April 12, 1912. Serial No. 690,278.

a resistance unit having a part adapted to I saidmember, said member andvalve plate being also arranged in heating relation with the utensil.

2. In an article of the character described, the combination with aresistance material, of heat-radiating members located at opposite sidesthereof, and a valve-plate located between said resistance material andone of said heat-radiating members and arranged in heat-conductiverelation with active parts of said radiating member and spaced from theinactive parts thereof.

3. in a device of thecharacter described, the combination withheatradiating members and an interposed resistance, of an up standingflange formed at the edge of one of the radiating members, a valve platelocated between said member and the resistance, and a flange on thevalve plate arranged in heat conductive relation to the flange on theradiating member.

4-. In an article of the character described, a resistance material, aradiating plate on each side thereof, one of which is provided with anedge flange, a valve plate located between the resistance and saidflanged radiating member and spaced from the latter, and a flange on thevalve plate arranged in heat-conductive relation with the flange 0n theradiating member.

5. The combination with an electrical heating element comprisingradiating member", and an interposed resistance material. of a valveplate located between one side of said resistance and the adjacentradiating member and spaced from the latter.

6. In an electrical heating unit, the com- 'bination with a resistance,radiating plates on opposite sides thereof, spaced from one another atall points, and insulation interposed between said resistance andradiating plates, .of a valve plate located between one of saidradiating plates and the insulation on the adjacent side of saidresistance, and separated supports located between said valve plate andadjacent radiating plate.

7 In an electrical heating unit the combination with a resistance andradiating plates located on opposite sides thereof and spaced from oneanother at all points, of a valve plate located between one of saidradiating plates and the adjacent side of said l'esistancmtlie mass ofsaid valve plate being less than the mass of the other radiating plate.

8. In an electrical heating unit a ra'diating plate provided with anupstanding circumferential flange at its edge, a second radiating; platelocated in juxtaposition to the first but spaced therefrom at all pointsand an interposed resistance, said resistance and second radiating platebeing, located within said upstanding flange.

9. The combination with an electrical heating unit comprising heatradiating members and an interposed resistance material, of a valveplate located against one side of said resistance material in heatingrelation therewith and spaced from the adja centradiating member.

JOSEPH F. LAMB. Witnesses:

I. M. BUsH, HAROLD GRACE.

